單項(xiàng)選擇題
A.2% B.3% C.4% D.5%
A.水解和水化反應(yīng) B.硬礙反應(yīng) C.離子交換和團(tuán)粒化作用 D.碘酸化作用
A.20km/h B.30km/h C.40km/h D.50km/h
A.3d B.7d C.14d D.28d
A.1m;0.25m B.1m;0.50m C.1.50m;0.25m D.1.50m;0.50m
A.1min B.3min C.5min D.10min
A.2~4m B.4~8m C.8~12m D.12~16m
A.CaCO3 B.Ca(OH)2 C.CaO D.CaSO4
A.長;小 B.長;大 C.短;小 D.短;大
A.1:1.15 B.1:1.25 C.1:1.3 D.1:1.5